Saw rig



June 10, 1930.

G. Ffcl-IAPER Er AL 1,762,798

SAW RIG Filed Aug. 21, 1928 v 2 Sheets-Sheet 1 G. F. scHAPER ET AL SAW-RIG June l0, 1930.

- Filed Aug. 21. 1928 2 Sheets-Sheet 2 n )6 l y l 2e 38 52 Y i IN1/'einfan- @enge :Schaper John en. ,Scam

/v Moi-Mgg' 35.0 plaint of the;speci-f1cation.

Patented June 10, 1930 *l PATENT Grosser; ,SCRAP-uu AND JOHN A.. sculvrrrzforruzaaaaux, hermosura sew :alsy

applicati@ .iea'Augst 21,v 192s. serial no. `301,1425.A

- 10 table supported upon and elevated to a convenient-height 'above the automobile fra-me and through-ia slot `i'nvvhi'clrthe vcircular saw eXtendsI A" still `further. object :is .the `provision o-f a 3:15 `saw rig 'of .the general character described,

Y. wherein the saWmandrel :is carried atthe upper endoa yoke. pivotal'ly -mountedsto perm-it advancing the saw :across the ytable vrin the operation of using the saw.

A still further Objectis the provisionofa V-saW rig of Vithexgeneral character described, the table of Which is provided :With adjustable guides for positioning thefwork accuj v arrows.. Y,

@he saw rig @four invention .-i-sadapted 115 to beunounted upon .the lc-hassisofan autorate-ly at'any desired .angle i-nrespect .tothe 1:25 planeof the saw;

j AfAstill furtherv Objectis-.the 'provision nf Aan improved type of mounting for the yoke, -Whereuponlthe saw 4mandrel is ourna-lled so that theoriginal journalling of `the propeller "$0 shaft of ythe vehicle may lbev preserved.

A vsti-ll further lobject is the provision `or an improved Itype of mounting for Athe yoke, ,Wherebyfit may be pivotedbelow the drive shaft,- permitting the useqof a longer ,yoke

35 thanV Would be the case if'ythe yoke were journalled for pivotal Ymovement. aboutsan. Y This :motor rmay rbe the; motor .which the vehicle Vwas originally equipped, and/or axis coincident with that of the drive shaft. As .a `result, the rradial distance between the pivotal mounting of .thegyoke and ythe axis s0 ofthe mandrel VLisincreasezh sothat for ia y given distance of advancefoi the saw., less Avariation in ithe height of the saw above fthe table results. Y

The :invention possesses, other objects and .f 745 `advantageous,features, some :of which, With those enumeratedpwillfbe s etforth in' the following description of the inventions :par-

ticular embodiment whichY is illustrated `in the drawings va@compa'nying Aiorining Aa .ture'of fthe invention. e

The: form of construction rherein :,disi' closed, has in actual use, provenv yto 1 be `very .eiiicienft, capable `of facile :and rapid'loperaftion, 'and generally desirable other re- @speets ,For these reasons1'the .details 4herei5 iin disclosed may 'be iconsidered :as prefermed.

lt' should :bei mentioned however., that While these details will hereinafter :be spec'iuiiea'lly '.desloribed, variati-ons 'be effected Within the scope of the iinvenftonfas `claimed. Referring to ille drawings.: :Figline lis asideielevation of the saw rig fof our invention, `portions lof the .framework bein-g broken awa-y -to better reveal the :na-

is a top Aplan-view.. j g

. :Fig is an enlarged :detaifl View of `,a portion of the device; l t

' vi3d-ig. 4 Fis .aside elevation of the structure Yfof -F 3.tl-f1i's view beinga sectional `view ifm r'talren transversely Yof the tramethe planes" vof section :being :indicated by the .Lines loft 3,'.andfthe l direction of vieW-:byrthe ,res-ult that -a `suitable rame .and vmeans :of gp Y Ytranen,or-,tation tor the saw rig may ..bepro- '-videdlatrelativeiy little (expense. Y f Accordingly, the yinvention .comprises .an f

automobile yframe y6 .provided `with .support Wheels suitably journalled thereon, .g5

A andwith an `internal,combustion motor Q8.

it maybe .any other Inotor'substituted there-v ioi.' Ineither event, convenient means .for ,90"

Ymountingv .the motor .areaforded .by the i "rossqmembers` uponwhiich .the vehicle mo- :tor was-originally supported upon the frame A y 1 6'. Preferably a Vchange-speed transmission V.9 is also provi-ded vforfvarying the speed of'fgs' rotation ofthe .drive shaft 11.'Y

" By utilizing theloriginal mountingl for .the Y motor, the original V`j L irnafll'ing ofthe; drive. shaft l1 may be preserved, 'it .being"under-v Stood however, 'that .theconnectonfbetween im Vsaw table 19.

this shaft and the rear wheels 7, is broken, as it is-intended that in the transportation of the saw rig, it shall be towed by another vehicle. Additional journals 12 and 13 for the shaft 11, are rigidly connected to the frame 6 by means of cross members 14 and 16, respectively- A pair of timbers 17 or steel beams are disposed longitudinally upon the frame 6, these timbers being raced by preferably a 'plurality of transversely disposed timbers 18 or steel beams for the rigid support of a A transversely disposed slot 21 is provided in the table 19, this `slot being elongated to permit advance of the saw 22 which extends therethrough.

Thefsaw 22 is carried by a mandrel 23 `revolubly mounted adjacent the under side of the table 19 `in journals 24 carried at -the upper end of a yoke 26, thisyoke being mounted for pivotal movement about an axis parallel to and below the shaft .11. To provide this mounting, aligned eyes 27 are secured at the lower end of the yoke, these eyes being revolubly mounted upon a rod 28 rigidly connected to the cross members 14 and 16 by brackets '31 and 32. The yoke 26 is disposed in front of the power shaft 11; and in order to permit swinging the yoke backwards, the arms 333 with which the eyes 27 are integrally formed, are provided with an oifset 34, as clearly shown upon Fig. 4. vA coil spring 36 is under tension between the yoke 26 and a bar 37 rigid with a pairof transverse timbers 18 at the back jof the frame for the saw table 19,' resulting in the normal retention of the saw 22 and yoke 26 in retracted position.A A pedal 38 is rigidly connected to the yoke 26, this pedal extending to a point accessible from the front of the rig for advancing the saw 22`across the table through the slot 21 and "against the action of the spring 36.

A'drive pulley 41 is rigid with the shaft 11, and an aligned driven pulley 42 is V'provided upon the mandrel 23. A belt 43 engages both these pulleys, with the'result that Vthe lsaw 22v is rotated when the motor 8 is in operation. Since the axis of Vrevolution-of the yoke 26 and the axis of the shaft 11 are not coincident, variation in the distance between the axesof the mandrel 23 and the shaft 11, occurs as the yoke 26 is swung about Lits pivotal mounting. Accordingly, the belt y43 is of such length that it does not tightly engage the pulleys 41 and 42 without being engaged by an idler pulley 44 journalled atthe lower end of preferably Y .ftwo arms 46 which are mounted for pivotal movement upon a bracket 47 rigid with the yoke 26. A vbar 48 is also rigidly mounted upon the yoke'26, for the reception of a Y spring 49 which is Linder compression between one ofthe. arms 46 and a nut51 threaded vupon the bar 48, to press the idler pulley 44 into engagement with the belt 43 to vary its effective length and retain it in driving engagement with the pulleys 41 and 42.

In order to accommodate the pulley 41 and belt 43, the rod 28 is deformed as at 52, leaving a space within which the pulley 41 and belt 43 may operate without interference.

In operating the saw rig of our invention, power is applied to the-saw 22 by means of the motor 8, the transmission 9 being so adjusted as to impart the desired rotational speed to the saw 22. The idler pulley 44 will hold the belt 43 tight enough to drive the mandrel 23 and saw 22 from the power shaft 11, but will permit lengthening of the belt as the yoke 26 is swung forwards about its pivotal mounting. This forward swinging may be easily e ected by stepping upon the pedal 38, resulting in swinging the saw across the table lengthwise of the slot 21, so that the saw 22 will cut any work lying upon the table 19 across the slot 21.

Proper positioning of the work may be assured by the use of guides 56 which are adjustably mounted upon the top of the table 19. A pivot pin 57 is rigid with the table 19 adjacent each side of the slot 21, and a guide 56, preferably an elongated strip of any suit-able material, is pivoted upon each of these pins 57. Proper adjustment of the guidesv 56 may be gained by loosening the C clamps 58, one of which is provided for each guide 56, and which may be tightened to rigidly clamp the guide 56 to the table in selected adjustment.

We claim:

1. A portable saw rig comprising an automobile frame, supporting wheels journalled thereon, a motor carried by the frame, a power shaft operatively connected to the motor and ournalled upon the frame to extend longitudinally thereof, a drive pulley rigid with said shaft, a yoke mounted upon said frame for pivotalmovement about an axis lower than and slightly offset from said shaft, a saw table mounted upon said frame, a mandrel journalled upon said yoke adjacent the under side of the table, a saw carried by said mandrel and extending through a slot in said table, said. slot being extended to permit swinging said yoke to advance vthe saw acrossthe table, a driven pulley rigid with the mandrel, and a belt engaging both pulleys. i Y

2. A portable saw rig comprising an automobile frame, supporting'wheels journalled thereon, a motor carried by the frame, a

power shaft operatively :connected to the shaft, a saw table mounted uponsaid frame,

' a mandrel journalled upon said yoke adjathe saw across the table, a driven pulley rigid with the mandrel, a belt engaging both pulleys, and means for varying the eective length of said belt. j

3. A portable saw rig comprising an au-.-

tomobile frame, supporting wheels journalled thereon, a motor carried by the frame, a power shaft operatively connected to the motor and journalled upon the frame to ex-` tend longitudinally thereof, a drive pulley rigid with said shaft, a yoke mounted upon said frame for pivotal movement about an u axis lower than and slightly offset from said shaft, a saw table mounted upon said frame, a mandrel journalledupon said yoke adjacent vthe under side of the table, a saw carried by said mandrel and extending through a slot in said table, said'slot being extended to permit swinging said yoke to advance the saw across the table, a driven pulley rigid with the mandrel, a belt engaging bot-h pulleys, an arm pivotally carried by said yoke, an idler pulley journa-lled on said arm, and resilient means interposed between said arm and yoke for pressing said idler pulley into engagement withthe belt.

4. A portable saw riglconiprising an automobile frame, supporting wheelsV journalled thereon, a motor carried by the frame, a power shaft operatively connected to the motor and journalled upon the frame to extend longitudinally thereof, a drive pulley rigid with said shaft, a yoke mounted upon said frame for pivotal movement about an' axis lower than and slightly offset from said shaft, a saw table mounted upon said frame, a mandrel journalled upon said yoke adjacent the under side of the table, a saw carried by said mandrel andextending through a slot in said table, said slot being extended to permit swinging said yoke to advance the saw across the table, a driven pulley rigidV with the mandrel, a belt engaging both pul-l leys, an'armrpivotally carried by saidvyoke, an idler pulley journalled on saidfarm, resilient means interposed between said arm. and yoke for pressing said idlerpulleyy into engagement with the belt, means for advancing said yoke, 'and resilient means'urging said yoke -to withdrawn position.

5. A portable saw rig vcomprising any auto-r 1 mobile frame, supporting wheels journalled thereon, a motor carried bythe framea power shaft operatively connected` to the.

motor and journalled upon the frame to extend longitudinally thereof, a drive pulley rigid with saidA shaft, a yoke mounted upon said frame for'pivotal movement about an axis lower thanand slightly offset from said Iried said mandrel yand extending through a slot in said table,fsaid slot being extended to permit swingingsaid yoke to Hadvance the sawacro'ss the table, a driven pulley rigid with the mandrel, a belt engaging both pulleys, Yan arm pivotally'carried'by said yoke,

lan idler pulley journalled on said arm, Vre" sillent means interposed vbetween said arm and yoke ,fory `pressingsaid vidler pulley into engagement with the belt,\-means normally retaining said yoke in' retracted position, vand ,a pedal Vcarried by the yoke whereby the yoke maybe swung to'advance the saw across the table.

6. In a portable saw rig, an rautomobile chassis .comprisinga frame, supportingy kwheels Journal'led thereupon, a motor,y and a ,Yy

powershaft coupled tosaid .motor, a saw .table mounted upon `said chassis, a' yoke -mounted upon said frame for pivotal movement about an axis lower than the power shaft, a mandrel jo'urnalled'upon thefree'.,y

end lof said yoke, a sawy carried by said mandrel and extending through a -slot in said -saw table,.said slot being extendedto permit swinging the saw across the table, a driven `pulley rigid with said mandrel,

'a .dr'ive'pulley'in line therewith and-rigid with .said Ydrive shaft,; and a` belt engaging both'of said pulleys. y

y V7. In a ,portable -saw.frig, fan automobile chassis comprising a' frame, 'supporting wheelsgjournalled thereupon, afmotor, and a `power shaft -coupledtosaidV motor, a saw table-mounted upon said chassis, a yoke shaft, "a 'mandreil'journalled upon the free drive pulley in line therewith and'rigidvwith saidd-rive shaft, .a belt l'engaging'both of said pulleys, an arm- Ypivotally `carried* by said yoke, anidler pulley vjournalled upon said mounted upon said framefor'pivotal movelment .about Vanaxis lowerthan the power m5V arm, andresilient means interposed betweenY said arm and yoke for pressing"r the idlerY pulley against the belt; f

8. In a portable saw rig, anA automobile chassis comprising a "frame, supporting wheels Journalled thereupon, a motor, anda power shaft coupled tosaidf motor, asaw mounted uponsaid frame for pivotal vInovetable mounted upon said chassis,y a'yoke shaft, a mandrel journalled upon the free y end of said yoke, Va saw carried by said man:v

drel and extending'through a-slot in said saw table, said slotbeingextended to `permit swinging the saw across the table, a driven pulley rigid with said mandrel, a drive'pulley in line therewith and rigid with said drivev shaft, a belt engagingboth of said pulleys, an :arm pivotally carried by said yoke, an idler pulley journalled upon said arm, resilient means interposed between said arm and yoke for pressing the idler pulley against the belt, means urging said yoke into retracted position, and a pedal extending laterally from adjacent the lower end of said yoke whereby the yoke may be swung against the action of said urging means.

9. In a portable saw rig, an automobile chassis comprising a frame, supporting wheels journalled thereupon, a motor, and a power shaft coupled to said motor, a saw table mounted upon said chassis, said saw table extending entirely over said frame, a yoke mounted upon said frame for pivotal movement about Y an axis lower than the power shaft, a mandrel ournalled upon the free end of said yoke, a sa'w carried by said mandrel and extending through a slot in said saw table, said slot being extended to permit swinging the saw across the table, a driven pulley rigid with said mandrel, a drive pulley in line therewith and rigid with said'drive shaft, and a belt engaging both of said pulleys.

10. In a portable saw rig, an automobile chassis comprising a frame, supporting wheels journalled thereupon, a motor, and apower shaft coupled to said motor, a saw i table mounted upon said chassis, said saw table being disposed at a greater elevation than any portion of its supporting structure, a yoke mounted upon said frame for pivotal movementabout an axis lower than the power shaft, a mandrel journalled upon uthe lfree end o f said yoke, a saw.V carried by said Vmandrel and extending through a slot in said saw table, said slot being extended to permit swinging the saw across the table, a driven pulley rigid with said mandrel, a drive pulley in line therewith and rigid with said drive shaft, and a belt engaging both of said pulleys. In testimony whereof we have signed our names to this specification.

GEO. F. SCHAPER. JOHN A. SCHMITZ. 

